1. AAPFCO (2012) 1985–2012 Commercial Fertilizer Data – ASCII Files by Region. [Online] Available at:
http://www.aapfco.org/publications.html
2. ANL (2014) The greenhouse gases, regulated emissions, and energy use in transportation model. [Online] Available at:
https://greet.es.anl.gov/main
3. Bala A, Raugei M, Benveniste G, Gazulla C, Fullana-i-Palmer P (2010) Simplified tools for global warming potential evaluation: when ‘good enough’ is best. Int J Life Cycle Assess 15(5):489–498
4. Capehart T, Liefert O (2017) Feed Outlook: May 2017. United States Department of Agriculture Economic Research Service. [Online] Available at:
https://www.ers.usda.gov/publications/pub-details/?pubid=83511
5. Chiu Y, Wu M (2012) Assessing county-level water footprints of different cellulosic-biofuel feedstock pathways. Environ Sci Technol 46:9155–9162